原则上超过（）的收单业务账务差错不予处理。
A.一个月
B.一季度
C.一年
D.两年
参考答案：C
用所给单词的适当形式填空。
1. Her room _____ (clean) every day.
2. His new clothes _____ (buy) the day before yester day.
3. This question _____ (discuss) next meeting.
4. The blackboard newspaper of our class _____ (often change)．
5. A new library _____ (built) in our school last year.
6. The supermarket _____ (close) this Saturday.
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